Oiling system for twin-engine motor-cycles.



G.-H. ELLIS.

OILING SYSTEM FOR TWIN ENGINE MOTOR CYCLES.

APPLICATION FILED DEC. 18, 19!].

Patented Oct. 29, 1918.

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GEORGE H. ELLIS, 013 LOS ANGELES, CALIFORNIA.

To all whom it may concern:

Be it known that I, GEORGE I-I. ELLIS, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Oiling Systems for Twin- Engine Motor- Cycles, of which the following is a specification.

My object is to improve and equalize the circulation of lubricating oil in twin cylinder motorcycle engines, and my invention consists in the novel features herein shown, described and claimed.

Figure 1 is a side elevation of a twin cylinder motorcycle engine equipped with a mechanical feeder, and modified in accordance with the principles of my invention.

Fig. 2 is a view in elevation of the rear piston removed from the cylinder as seen looking in the direction indicated by the arrow 2 in Fig. 8.

Fig. 3 is a fragmentary sectional detail on the lines 33 of Figs. 1 and 2.

Fig. 4 is a fragmentary elevation of the front piston removed from the casing.

The piston cylinders 1 and 2 upon a twin motorcycle engine stand in longitudinal alinement, that is, one in front of the other, and the cylinders are radial to the crank case 3 and crank shaft 4. Oil is fed to the crank case from the can 5 through the mechanical oiler 6 and fromthe oiler 6 through the pipe 7 to and through the nipple 8 to the inner face of the lower end of the cylinder 2. The crank shaft 4 runs in the direction indicated bythe arrow 9 in Fig. 1 and the oil within the crank case is splashed upwardly into the lower ends of the cylinders and against the bottoms of the pistons 10 and 11. The result is that the rear piston 10 receives an excess of lubricating oil from the crank case, and the forward piston 11 receives a deficiency of oil, and it is this difficulty that my invention is intended to overcome.

The cylinders 1 and 2 are mounted in bosses 12 and 13 extending from the crank case 8, there being a partition 14 between the openings through these bosses to the cyl inder chambers. I cut away the lower edge 15 of this partition to form a passage having the bottom line 16 leading from the OILING SYSTEM FOR TWIN-ENGINE MOTOR-CYCLES.

Specification of Letters Patent. V Patgyited 1 29, 191$, Application filed December 18, 1917.

Serial No. 207,773.

opening to the piston 10 upwardly to the opening to the piston 11 so as to increase the freedom with which the oil will pass to the piston 11. Heretofore the downwardly extending edge of the partition portion 14 has served as an obstruction to this free passage of oil.

In order to return the surplus of oil from the cylinder 1, I bore four drain holes 17 through the wall of the piston 10 immediately below the lower piston ring 18 and on opposite sides of the cross head pin 19 and slanting inwardly and downwardly So that the oil which goes up against the piston ring 18 will drain through the openings 17 into the hole 20 below the piston head and back into the crank case.

The nipple 8 leading oil through the cylinder 2 is comparatively close to the bottom of the cylinder and the oil does not go up around the piston 11 to a suflicient extent. In order to overcome this difficulty I remove the nipple 8, put a marker through the opening against the face of the piston, and work the piston up and down, thereby producing the mark 21. Then I take the piston out of the cylinder and file a flat depression 22 at the lower end Of the mark 21 and a V- shaped groove 23 leading upwardly at an angle of about forty-five degrees from the top of the depression 22. The depression 22 comes directly opposite the inner end of the nipple 8 and is filled with oil at each stroke of the piston and this oil goes up with the piston, and when the piston returns, the oil in the depression 22 is forced upwardly through the groove 28 and this serves to distribute the oil around the piston 11.

In actual practice, I have found that an engine equipped as heretofore described is greatly improved in the point of the circulation of lubricating oil from the crank case, the rear cylinder not being over lubricated and the front cylinder being sufliciently lubricated, so that there is practically an equal lubrication of both cylinders, a result which hitherto has not been the case with the type of motors described.

While I have shown the preferred construction of my oiling system for twin-engine motorcycles, as now known to me, it will be understood by those skilled in the art that various changes in the combination, to a crank case, a Wall between the lower construction and arrangement of parts may ends of the cylinders having an inner face be made Without departing from the spirit sloping upwardly to the forward cylinder 1 of my invention as claimed. chamber.

5 I claim: In testimony whereof I have signed my In a gas engine having two cylinders name to this specification.

mounted one in front of the other and radial GEORGE H. ELLIS.

Copies of this. patent may be obtainedi for five cents each, by addressing the Commissioner of Patents.

Washington, D. G. 

